forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
72 lines
1.7 KiB
72 lines
1.7 KiB
/* |
|
* include/linux/pagevec.h |
|
* |
|
* In many places it is efficient to batch an operation up against multiple |
|
* pages. A pagevec is a multipage container which is used for that. |
|
*/ |
|
|
|
#ifndef _LINUX_PAGEVEC_H |
|
#define _LINUX_PAGEVEC_H |
|
|
|
/* 14 pointers + two long's align the pagevec structure to a power of two */ |
|
#define PAGEVEC_SIZE 14 |
|
|
|
struct page; |
|
struct address_space; |
|
|
|
struct pagevec { |
|
unsigned long nr; |
|
unsigned long cold; |
|
struct page *pages[PAGEVEC_SIZE]; |
|
}; |
|
|
|
void __pagevec_release(struct pagevec *pvec); |
|
void __pagevec_lru_add(struct pagevec *pvec); |
|
unsigned pagevec_lookup_entries(struct pagevec *pvec, |
|
struct address_space *mapping, |
|
pgoff_t start, unsigned nr_entries, |
|
pgoff_t *indices); |
|
void pagevec_remove_exceptionals(struct pagevec *pvec); |
|
unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping, |
|
pgoff_t start, unsigned nr_pages); |
|
unsigned pagevec_lookup_tag(struct pagevec *pvec, |
|
struct address_space *mapping, pgoff_t *index, int tag, |
|
unsigned nr_pages); |
|
|
|
static inline void pagevec_init(struct pagevec *pvec, int cold) |
|
{ |
|
pvec->nr = 0; |
|
pvec->cold = cold; |
|
} |
|
|
|
static inline void pagevec_reinit(struct pagevec *pvec) |
|
{ |
|
pvec->nr = 0; |
|
} |
|
|
|
static inline unsigned pagevec_count(struct pagevec *pvec) |
|
{ |
|
return pvec->nr; |
|
} |
|
|
|
static inline unsigned pagevec_space(struct pagevec *pvec) |
|
{ |
|
return PAGEVEC_SIZE - pvec->nr; |
|
} |
|
|
|
/* |
|
* Add a page to a pagevec. Returns the number of slots still available. |
|
*/ |
|
static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page) |
|
{ |
|
pvec->pages[pvec->nr++] = page; |
|
return pagevec_space(pvec); |
|
} |
|
|
|
static inline void pagevec_release(struct pagevec *pvec) |
|
{ |
|
if (pagevec_count(pvec)) |
|
__pagevec_release(pvec); |
|
} |
|
|
|
#endif /* _LINUX_PAGEVEC_H */
|
|
|